Note 12 - Summarized Quarterly Data (unaudited) (Detail) - Quarterly Results of Operations (USD $)	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
2013
Total revenue	$ 36,315,201	$ 34,626,892	$ 31,127,971
Gross margin before depreciation	11,188,923	10,566,393
Net income	1,478,212	3,876,032	3,910,841
Basic earnings (in Dollars per share)	$ 0.24	$ 0.63	$ 0.65
Diluted earnings (in Dollars per share)	$ 0.24	$ 0.62	$ 0.62
By Quarter (Member) | First Quarter (Member)
2013
Net income	1,062,329	919,659
By Quarter (Member) | Second Quarter (Member)
2013
Net income	828,782	911,553
By Quarter (Member) | Third Quarter (Member)
2013
Net income	(509,484)	724,968
By Quarter (Member) | Fourth Quarter (Member)
2013
Net income	96,585	1,319,852
By Quarter (Member)
2013
Net income	1,478,212	3,876,032
First Quarter (Member)
2013
Total revenue	9,658,193	8,637,924
Gross margin before depreciation	3,068,390	2,577,214
Basic earnings (in Dollars per share)	$ 0.17	$ 0.15
Diluted earnings (in Dollars per share)	$ 0.17	$ 0.15
Second Quarter (Member)
2013
Total revenue	7,729,837	7,575,788
Gross margin before depreciation	2,560,569	2,426,005
Basic earnings (in Dollars per share)	$ 0.14	$ 0.15
Diluted earnings (in Dollars per share)	$ 0.13	$ 0.14
Third Quarter (Member)
2013
Total revenue	8,635,804	8,279,910
Gross margin before depreciation	2,558,493	2,434,058
Basic earnings (in Dollars per share)	$ (0.08)	$ 0.12
Diluted earnings (in Dollars per share)	$ (0.08)	$ 0.12
Fourth Quarter (Member)
2013
Total revenue	10,291,367	10,133,270
Gross margin before depreciation	$ 3,001,471	$ 3,129,116
Basic earnings (in Dollars per share)	$ 0.02	$ 0.22
Diluted earnings (in Dollars per share)	$ 0.02	$ 0.21